Pulse or digital communications – Receivers
Patent
1998-04-27
1999-07-06
Ghebretinsae, Temesghen
Pulse or digital communications
Receivers
375326, 370206, H04L 2706, H04L 506, H04J 1100
Patent
active
059205989
ABSTRACT:
An apparatus and method for receiving an OFDM signal arranged to reproduce correct carriers. I channel data and Q channel data decomposed into subcarrier components by FFT processing are differential-demodulated by a differential demodulation circuit to remove an FFT window phase error and a reproducing carrier phase error. In a differential demodulation circuit, a reproducing carrier frequency error and a phase error dependent on a reproducing clock frequency error are removed and only I-axis data is thereafter output to be stored in a RAM with respect each symbol. A pilot signal selecting data generation circuit supplies the RAM with data which is prepared by suitably shifting pilot signal selecting data used as a reference. Resulting Data read out is accumulated by cumulative addition performed by a cumulative addition circuit. A maximum value detection circuit detects a maximum value of the output from the cumulative addition circuit, and the amount of shift of pilot signal selecting data is stored in a reproducing carrier frequency error storage circuit. The reproducing carrier frequency error storage circuit outputs the amount of shift corresponding to the maximum value.
REFERENCES:
patent: 5471464 (1995-11-01), Ikeda
patent: 5506836 (1996-04-01), Ikeda et al.
patent: 5771224 (1998-06-01), Seki et al.
patent: 5838734 (1998-11-01), Wright
Hyakudai Toshihisa
Ikeda Yasunari
Ghebretinsae Temesghen
Sony Corporation
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